land use classes 土地利用分类 ; 用地类型
And, since our two mapped classes (Building and Land) inherit from Estate, we can use this abstract superclass in our HQL queries, as shown in Listing 14.
而且，因为两个映射的类(Building和Land)是从estate中继承而来，所以我们可以在HQL查询中使用这个抽象超类，如清单14所示。
So, we'll use the Land and Building classes to give our developers more comprehensive objects to work with.
所以，我们要用 Land和 Building类给我们的开发人员提供更具体的操作对象。
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